Hi,
I would like to know, how we can add custom fields in products and customer flow.
I know we can create new flow and add fields in it, but would like to know, how we can add to products and customers?

Hi, sorry for the delayed answer, there’s some existing documentation around custom data that you might find helpful. The API Reference shows the list of resources you can create or extend with flows, whereas the Developer Portal provides hands-on walkthrough on selected scenarios like extending a product, creating a wishlist or a blog. Hope these links are helpful to you!
Regards,
Joanna